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U.S. patents covering time keeping mechanisms (1923)



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Author: United States. Patent Office
Subject: Clocks and watches
Publisher: [Washington, D.C.] : U.S. Patent Office
Year: 1923
Language: English
Call number: 39088008027344
Digitizing sponsor: Smithsonian Libraries
Book contributor: Smithsonian Libraries
Collection: smithsonian
Notes: The text is faint on several pages throughout this book.

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Includes patent specifications nos. 1,440,363 to 1,478,939


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Sponsordate: 20120229

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